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Parent Company Only Financial Statements Condensed statements of cash flows (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |
Net income | $ 4,625 | $ 7,595 | $ 8,200 | $ 6,264 | $ 36,600 | $ 26,684 | $ 21,840
Depreciation, amortization and accretion, net |  |  |  |  | 7,881 | 8,134 | 7,936
Increase in other assets |  |  |  |  | (4,266) | 668 | 1,802
Increase (decrease) in other liabilities |  |  |  |  | (7,846) | 666 | (2,875)
Net cash provided by operating activities |  |  |  |  | 42,175 | 46,154 | 27,422
Cash Acquired from Acquisition |  |  |  |  | 56,389 | 0 | 36,774
Net cash used in investing activities |  |  |  |  | (10,961) | (55,962) | (78,059)
Repayment of short-term debt |  |  |  |  | 0 | (4,000) | (3,938)
Proceeds from short-term debt |  |  |  |  | 0 | 0 | 7,000
Repayments of Long-term Debt |  |  |  |  | (10,313) | (3,750) | 0
Proceeds from long-term debt |  |  |  |  | 0 | 0 | 15,000
Proceeds from issuance of common stock |  |  |  |  | 36,645 | 4,399 | 195
Payments for Repurchase of Common Stock |  |  |  |  | (138) | (797) | 0
Direct expenses related to capital transactions |  |  |  |  | (2,309) | (216) | (229)
Dividends paid on preferred stock |  |  |  |  | 0 | 0 | (1,286)
Dividends paid on common stock |  |  |  |  | (8,792) | (7,228) | (5,277)
Net cash provided by (used in) financing activities |  |  |  |  | 21,307 | (77,215) | 110,755
Increase (decrease) in cash |  |  |  |  | 52,521 | (87,023) | 60,118
Cash and cash equivalents at beginning of period |  |  |  | 175,902 | 88,879 | 175,902 | 115,784
Cash and cash equivalents at end of period | 88,879 |  |  |  | 141,400 | 88,879 | 175,902
Parent Company [Member] |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |
Net income |  |  |  |  | 36,600 | 26,684 | 21,840
Depreciation, amortization and accretion, net |  |  |  |  | 90 | 82 | 87
Dividends from subsidiaries |  |  |  |  | 21,694 | 18,925 | 19,475
Equity in undistributed earnings of subsidiaries |  |  |  |  | (18,885) | (9,570) | (4,717)
Increase in other assets |  |  |  |  | (1,645) | (19,348) | (111,379)
Increase (decrease) in other liabilities |  |  |  |  | 79 | 733 | 153
Net cash provided by operating activities |  |  |  |  | 37,933 | 17,506 | (74,541)
Payments to Acquire Additional Interest in Subsidiaries |  |  |  |  | (13,430) | 0 | (5,000)
Cash Acquired from Acquisition |  |  |  |  | (29,321) | 0 | 68,798
Net cash used in investing activities |  |  |  |  | (42,751) | 0 | 63,798
Repayment of short-term debt |  |  |  |  | 0 | (4,000) | (3,000)
Proceeds from short-term debt |  |  |  |  | 0 | 0 | 7,000
Repayments of Long-term Debt |  |  |  |  | (10,313) | (3,750) | (938)
Proceeds from long-term debt |  |  |  |  | 0 | 0 | 15,000
Proceeds from issuance of common stock |  |  |  |  | 36,645 | 4,399 | 195
Payments for Repurchase of Common Stock |  |  |  |  | (138) | (797) | 0
Direct expenses related to capital transactions |  |  |  |  | (2,309) | (216) | (229)
Dividends paid on preferred stock |  |  |  |  | 0 | 0 | (1,286)
Dividends paid on common stock |  |  |  |  | (8,792) | (7,228) | (5,277)
Net cash provided by (used in) financing activities |  |  |  |  | 15,093 | (11,592) | 11,465
Increase (decrease) in cash |  |  |  |  | 10,275 | 5,914 | 722
Cash and cash equivalents at beginning of period |  |  |  | $ 2,382 | 8,296 | 2,382 | 1,660
Cash and cash equivalents at end of period | $ 8,296 |  |  |  | $ 18,571 | $ 8,296 | $ 2,382

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